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Old 12-26-2015, 12:28 AM   #631
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Shorter rear arms promote less rear traction, not more!
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Old 12-26-2015, 09:10 AM   #632
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Shorter rear arms promote less rear traction, not more!
in corner entry yes ...maybe depending on roll center front to rear offset but most don't need it ...but on exit every set up theory book,manual, notes for the last 17years ive used has always stated narrowing rear track width will provide more grip on exit and if you payed attention in this thread most where having a problem with wash out on exit due to the natural drag of this car ...so thats why most of us where running narrow rear set-up and the reason why the car was developed with different rear pivot options but im not going to dig into that aspect

check out the Hudy set-up books ....probably the most used worldwide
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Old 12-26-2015, 09:43 AM   #633
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isn't it very contra productive to go a short arm to narrow the rear?

because as far as i know a narrowed rear will make the car more grippy but the short arm has the opposite effect.
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Old 12-26-2015, 10:36 AM   #634
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isn't it very contra productive to go a short arm to narrow the rear?

because as far as i know a narrowed rear will make the car more grippy but the short arm has the opposite effect.
Can you explain that? (Not denying it by the way!)

We have several hex and eventually several arm options on this car, so would be interesting to know the theoretical changes behind each!?
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Old 12-26-2015, 12:57 PM   #635
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Gull arms on the front does what exactly?
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Old 12-26-2015, 01:47 PM   #636
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Can you explain that? (Not denying it by the way!)

We have several hex and eventually several arm options on this car, so would be interesting to know the theoretical changes behind each!?
A shorter arm normally reduces grip due to different roll caracteristics.

But when you narrow the rear end you will get a car that doesn't want to rotate around it's front end as much, basicly making it more grippy.

So it counteracts each other.
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Old 12-26-2015, 05:31 PM   #637
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A shorter arm normally reduces grip due to different roll caracteristics.

But when you narrow the rear end you will get a car that doesn't want to rotate around it's front end as much, basicly making it more grippy.

So it counteracts each other.
Ok cool, so potentially keeping the s4 arm instead of the Yz-2 arm, but using the 5mm or 4.3mm hex on the rear may be a useful thing to test!
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Old 12-26-2015, 05:33 PM   #638
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Gull arms on the front does what exactly?
I've seen contradictory stuff on that, but I am told by someone good who runs the car that it improves it on bumps, and removes some steering.
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Old 12-26-2015, 09:55 PM   #639
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Gull arms on the front does what exactly?
On very high grip tracks it makes the steering less twitchy and also handles better in the rough.

This is per some setup sheets I'm seeing the last one being Lee Martins'.

I haven't tried them myself I like a ton of steering and a responsive car on the local indoor clay track. Definitely might try it on Astro.
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Old 12-27-2015, 03:35 PM   #640
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Has anyone ran their YZ4 with adding -2.5 more kick up? If so what is the verdict? Thinking that running -2.5 inserts may help take some twitch out of the steering especially since I made a mistake in buying the 8 degree aluminum caster blocks when I should have bought 12.5 (I heard the 8 degree aluminum casters are closer to the 10 degree kit composite casters, however I am not sure if that is true.

Thank you
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Old 12-27-2015, 04:16 PM   #641
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Has anyone ran their YZ4 with adding -2.5 more kick up? If so what is the verdict? Thinking that running -2.5 inserts may help take some twitch out of the steering especially since I made a mistake in buying the 8 degree aluminum caster blocks when I should have bought 12.5 (I heard the 8 degree aluminum casters are closer to the 10 degree kit composite casters, however I am not sure if that is true.

Thank you
If you want to return to something like the kit caster you'll need to increase the rake angle by +2.5. That will give you 10.5, but I'm confused why you dont go back to the original caster blocks and then mess with rake angle inserts from there.
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Old 12-27-2015, 04:27 PM   #642
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Where did you get those battery charger wires?
I got them from A main there Made by TQ
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Old 12-28-2015, 02:32 AM   #643
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Those who are running the YZ-2 front arms how did they effect the handling of the buggy and secondly to they break as easy as the YZ4 front arms thanks.
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Old 12-28-2015, 08:33 AM   #644
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Those who are running the YZ-2 front arms how did they effect the handling of the buggy and secondly to they break as easy as the YZ4 front arms thanks.
Not worth the extra work trying to make them fit. Also broke the yz2arm but in a different spot.. ha!
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Old 12-28-2015, 10:09 AM   #645
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anyone know who might have a rear carbon shock tower #z4-018 in stock in the usa?

when using the schumacher wide stagger rib front tires without inserts, do you vent them (put a hole in them)?
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